//package com.example.demo.service;
//
//import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
//import com.example.demo.dto.RegisterDTO;
//import com.example.demo.exception.UserAlreadyExistsException;
//import com.example.demo.exception.ValidationException;
//import com.example.demo.model.User;
//import com.example.demo.model.UserBook;
//import org.springframework.security.core.AuthenticationException;
//import org.springframework.security.core.userdetails.UserDetails;
//import org.springframework.security.core.userdetails.UsernameNotFoundException;
//import org.springframework.transaction.annotation.Transactional;
//
//import javax.validation.Valid;
//
//public interface AuthService {
//
//    User registerUser(RegisterDTO registerDTO) throws UserAlreadyExistsException, ValidationException;
//
//
//    UserDetails loadUserByUsername(String username) throws UsernameNotFoundException;
//
//    UserDetails authenticateUser(String username, String password);
//
//
//}
